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Commit | Line | Data |
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20263082 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
20263082 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
20263082 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
20263082 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
90a18413 | 23 | #include <fcntl.h> |
90a18413 | 24 | #include <linux/kd.h> |
4f5dd394 | 25 | #include <linux/vt.h> |
90a18413 | 26 | #include <signal.h> |
20263082 | 27 | #include <string.h> |
90a18413 | 28 | #include <sys/ioctl.h> |
20263082 LP |
29 | #include <unistd.h> |
30 | ||
cc377381 | 31 | #include "sd-messages.h" |
4f5dd394 | 32 | |
b5efdb8a | 33 | #include "alloc-util.h" |
430f0182 | 34 | #include "audit-util.h" |
cc377381 | 35 | #include "bus-error.h" |
4f5dd394 LP |
36 | #include "bus-util.h" |
37 | #include "escape.h" | |
3ffd4af2 | 38 | #include "fd-util.h" |
4f5dd394 | 39 | #include "fileio.h" |
6482f626 | 40 | #include "formats-util.h" |
c004493c | 41 | #include "io-util.h" |
3ffd4af2 | 42 | #include "logind-session.h" |
4f5dd394 | 43 | #include "mkdir.h" |
6bedfcbb | 44 | #include "parse-util.h" |
4f5dd394 | 45 | #include "path-util.h" |
8b43440b | 46 | #include "string-table.h" |
288a74cc | 47 | #include "terminal-util.h" |
b1d4f8e1 | 48 | #include "user-util.h" |
4f5dd394 | 49 | #include "util.h" |
20263082 | 50 | |
5f41d1f1 LP |
51 | #define RELEASE_USEC (20*USEC_PER_SEC) |
52 | ||
53 | static void session_remove_fifo(Session *s); | |
54 | ||
9444b1f2 | 55 | Session* session_new(Manager *m, const char *id) { |
20263082 LP |
56 | Session *s; |
57 | ||
58 | assert(m); | |
59 | assert(id); | |
4b549144 | 60 | assert(session_id_valid(id)); |
20263082 | 61 | |
14c3baca | 62 | s = new0(Session, 1); |
20263082 LP |
63 | if (!s) |
64 | return NULL; | |
65 | ||
98a28fef | 66 | s->state_file = strappend("/run/systemd/sessions/", id); |
20263082 LP |
67 | if (!s->state_file) { |
68 | free(s); | |
69 | return NULL; | |
70 | } | |
71 | ||
d5099efc | 72 | s->devices = hashmap_new(&devt_hash_ops); |
118ecf32 DH |
73 | if (!s->devices) { |
74 | free(s->state_file); | |
75 | free(s); | |
76 | return NULL; | |
77 | } | |
78 | ||
2b6bf07d | 79 | s->id = basename(s->state_file); |
20263082 LP |
80 | |
81 | if (hashmap_put(m->sessions, s->id, s) < 0) { | |
118ecf32 | 82 | hashmap_free(s->devices); |
f8e2fb7b | 83 | free(s->state_file); |
20263082 LP |
84 | free(s); |
85 | return NULL; | |
86 | } | |
87 | ||
88 | s->manager = m; | |
932e3ee7 | 89 | s->fifo_fd = -1; |
90a18413 | 90 | s->vtfd = -1; |
20263082 LP |
91 | |
92 | return s; | |
93 | } | |
94 | ||
95 | void session_free(Session *s) { | |
118ecf32 DH |
96 | SessionDevice *sd; |
97 | ||
20263082 LP |
98 | assert(s); |
99 | ||
14c3baca | 100 | if (s->in_gc_queue) |
71fda00f | 101 | LIST_REMOVE(gc_queue, s->manager->session_gc_queue, s); |
14c3baca | 102 | |
5f41d1f1 LP |
103 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
104 | ||
cc377381 LP |
105 | session_remove_fifo(s); |
106 | ||
ae5e06bd DH |
107 | session_drop_controller(s); |
108 | ||
118ecf32 DH |
109 | while ((sd = hashmap_first(s->devices))) |
110 | session_device_free(sd); | |
111 | ||
112 | hashmap_free(s->devices); | |
113 | ||
20263082 | 114 | if (s->user) { |
71fda00f | 115 | LIST_REMOVE(sessions_by_user, s->user->sessions, s); |
20263082 LP |
116 | |
117 | if (s->user->display == s) | |
118 | s->user->display = NULL; | |
119 | } | |
120 | ||
9418f147 LP |
121 | if (s->seat) { |
122 | if (s->seat->active == s) | |
123 | s->seat->active = NULL; | |
d7bd01b5 DH |
124 | if (s->seat->pending_switch == s) |
125 | s->seat->pending_switch = NULL; | |
9418f147 | 126 | |
49e6fdbf | 127 | seat_evict_position(s->seat, s); |
71fda00f | 128 | LIST_REMOVE(sessions_by_seat, s->seat->sessions, s); |
9418f147 | 129 | } |
20263082 | 130 | |
fb6becb4 LP |
131 | if (s->scope) { |
132 | hashmap_remove(s->manager->session_units, s->scope); | |
133 | free(s->scope); | |
134 | } | |
135 | ||
136 | free(s->scope_job); | |
1713813d | 137 | |
cc377381 | 138 | sd_bus_message_unref(s->create_message); |
20263082 LP |
139 | |
140 | free(s->tty); | |
141 | free(s->display); | |
142 | free(s->remote_host); | |
3f49d45a | 143 | free(s->remote_user); |
98a28fef | 144 | free(s->service); |
a4cd87e9 | 145 | free(s->desktop); |
20263082 LP |
146 | |
147 | hashmap_remove(s->manager->sessions, s->id); | |
98a28fef | 148 | |
d2f92cdf | 149 | free(s->state_file); |
20263082 LP |
150 | free(s); |
151 | } | |
152 | ||
9444b1f2 LP |
153 | void session_set_user(Session *s, User *u) { |
154 | assert(s); | |
155 | assert(!s->user); | |
156 | ||
157 | s->user = u; | |
71fda00f | 158 | LIST_PREPEND(sessions_by_user, u->sessions, s); |
9444b1f2 LP |
159 | } |
160 | ||
20263082 | 161 | int session_save(Session *s) { |
507f22bd | 162 | _cleanup_free_ char *temp_path = NULL; |
cc377381 | 163 | _cleanup_fclose_ FILE *f = NULL; |
20263082 LP |
164 | int r = 0; |
165 | ||
166 | assert(s); | |
167 | ||
9444b1f2 LP |
168 | if (!s->user) |
169 | return -ESTALE; | |
170 | ||
accaeded LP |
171 | if (!s->started) |
172 | return 0; | |
173 | ||
d2e54fae | 174 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0); |
20263082 | 175 | if (r < 0) |
dacd6cee | 176 | goto fail; |
20263082 | 177 | |
14c3baca LP |
178 | r = fopen_temporary(s->state_file, &f, &temp_path); |
179 | if (r < 0) | |
dacd6cee | 180 | goto fail; |
20263082 LP |
181 | |
182 | assert(s->user); | |
183 | ||
14c3baca LP |
184 | fchmod(fileno(f), 0644); |
185 | ||
20263082 LP |
186 | fprintf(f, |
187 | "# This is private data. Do not parse.\n" | |
90b2de37 | 188 | "UID="UID_FMT"\n" |
20263082 LP |
189 | "USER=%s\n" |
190 | "ACTIVE=%i\n" | |
0604381b | 191 | "STATE=%s\n" |
fb6becb4 | 192 | "REMOTE=%i\n", |
90b2de37 | 193 | s->user->uid, |
20263082 LP |
194 | s->user->name, |
195 | session_is_active(s), | |
0604381b | 196 | session_state_to_string(session_get_state(s)), |
fb6becb4 | 197 | s->remote); |
20263082 | 198 | |
a91e4e53 | 199 | if (s->type >= 0) |
507f22bd | 200 | fprintf(f, "TYPE=%s\n", session_type_to_string(s->type)); |
a91e4e53 | 201 | |
55efac6c | 202 | if (s->class >= 0) |
507f22bd | 203 | fprintf(f, "CLASS=%s\n", session_class_to_string(s->class)); |
55efac6c | 204 | |
fb6becb4 LP |
205 | if (s->scope) |
206 | fprintf(f, "SCOPE=%s\n", s->scope); | |
fb6becb4 LP |
207 | if (s->scope_job) |
208 | fprintf(f, "SCOPE_JOB=%s\n", s->scope_job); | |
20263082 | 209 | |
932e3ee7 | 210 | if (s->fifo_path) |
507f22bd | 211 | fprintf(f, "FIFO=%s\n", s->fifo_path); |
932e3ee7 | 212 | |
20263082 | 213 | if (s->seat) |
507f22bd | 214 | fprintf(f, "SEAT=%s\n", s->seat->id); |
20263082 LP |
215 | |
216 | if (s->tty) | |
507f22bd | 217 | fprintf(f, "TTY=%s\n", s->tty); |
20263082 LP |
218 | |
219 | if (s->display) | |
507f22bd | 220 | fprintf(f, "DISPLAY=%s\n", s->display); |
20263082 | 221 | |
558c6490 LP |
222 | if (s->remote_host) { |
223 | _cleanup_free_ char *escaped; | |
224 | ||
225 | escaped = cescape(s->remote_host); | |
226 | if (!escaped) { | |
227 | r = -ENOMEM; | |
dacd6cee | 228 | goto fail; |
558c6490 LP |
229 | } |
230 | ||
231 | fprintf(f, "REMOTE_HOST=%s\n", escaped); | |
232 | } | |
233 | ||
234 | if (s->remote_user) { | |
235 | _cleanup_free_ char *escaped; | |
236 | ||
237 | escaped = cescape(s->remote_user); | |
238 | if (!escaped) { | |
239 | r = -ENOMEM; | |
dacd6cee | 240 | goto fail; |
558c6490 LP |
241 | } |
242 | ||
243 | fprintf(f, "REMOTE_USER=%s\n", escaped); | |
244 | } | |
245 | ||
246 | if (s->service) { | |
247 | _cleanup_free_ char *escaped; | |
20263082 | 248 | |
558c6490 LP |
249 | escaped = cescape(s->service); |
250 | if (!escaped) { | |
251 | r = -ENOMEM; | |
dacd6cee | 252 | goto fail; |
558c6490 LP |
253 | } |
254 | ||
255 | fprintf(f, "SERVICE=%s\n", escaped); | |
256 | } | |
3f49d45a | 257 | |
558c6490 LP |
258 | if (s->desktop) { |
259 | _cleanup_free_ char *escaped; | |
98a28fef | 260 | |
558c6490 LP |
261 | |
262 | escaped = cescape(s->desktop); | |
263 | if (!escaped) { | |
264 | r = -ENOMEM; | |
dacd6cee | 265 | goto fail; |
558c6490 LP |
266 | } |
267 | ||
268 | fprintf(f, "DESKTOP=%s\n", escaped); | |
269 | } | |
a4cd87e9 | 270 | |
bf7825ae | 271 | if (s->seat && seat_has_vts(s->seat)) |
92bd5ff3 | 272 | fprintf(f, "VTNR=%u\n", s->vtnr); |
20263082 | 273 | |
49e6fdbf | 274 | if (!s->vtnr) |
e6494a07 | 275 | fprintf(f, "POSITION=%u\n", s->position); |
49e6fdbf | 276 | |
20263082 | 277 | if (s->leader > 0) |
90b2de37 | 278 | fprintf(f, "LEADER="PID_FMT"\n", s->leader); |
20263082 LP |
279 | |
280 | if (s->audit_id > 0) | |
507f22bd | 281 | fprintf(f, "AUDIT=%"PRIu32"\n", s->audit_id); |
20263082 | 282 | |
9444b1f2 LP |
283 | if (dual_timestamp_is_set(&s->timestamp)) |
284 | fprintf(f, | |
90b2de37 ZJS |
285 | "REALTIME="USEC_FMT"\n" |
286 | "MONOTONIC="USEC_FMT"\n", | |
287 | s->timestamp.realtime, | |
288 | s->timestamp.monotonic); | |
9444b1f2 | 289 | |
6d33772f DH |
290 | if (s->controller) |
291 | fprintf(f, "CONTROLLER=%s\n", s->controller); | |
292 | ||
dacd6cee LP |
293 | r = fflush_and_check(f); |
294 | if (r < 0) | |
295 | goto fail; | |
14c3baca | 296 | |
dacd6cee | 297 | if (rename(temp_path, s->state_file) < 0) { |
20263082 | 298 | r = -errno; |
dacd6cee | 299 | goto fail; |
20263082 LP |
300 | } |
301 | ||
dacd6cee LP |
302 | return 0; |
303 | ||
304 | fail: | |
305 | (void) unlink(s->state_file); | |
14c3baca | 306 | |
dacd6cee LP |
307 | if (temp_path) |
308 | (void) unlink(temp_path); | |
309 | ||
310 | return log_error_errno(r, "Failed to save session data %s: %m", s->state_file); | |
20263082 LP |
311 | } |
312 | ||
dacd6cee | 313 | |
20263082 | 314 | int session_load(Session *s) { |
9444b1f2 | 315 | _cleanup_free_ char *remote = NULL, |
a185c5aa LP |
316 | *seat = NULL, |
317 | *vtnr = NULL, | |
be94d954 | 318 | *state = NULL, |
e6494a07 | 319 | *position = NULL, |
a185c5aa | 320 | *leader = NULL, |
55efac6c | 321 | *type = NULL, |
9444b1f2 LP |
322 | *class = NULL, |
323 | *uid = NULL, | |
324 | *realtime = NULL, | |
6d33772f DH |
325 | *monotonic = NULL, |
326 | *controller = NULL; | |
a185c5aa LP |
327 | |
328 | int k, r; | |
329 | ||
20263082 LP |
330 | assert(s); |
331 | ||
a185c5aa LP |
332 | r = parse_env_file(s->state_file, NEWLINE, |
333 | "REMOTE", &remote, | |
fb6becb4 LP |
334 | "SCOPE", &s->scope, |
335 | "SCOPE_JOB", &s->scope_job, | |
932e3ee7 | 336 | "FIFO", &s->fifo_path, |
a185c5aa LP |
337 | "SEAT", &seat, |
338 | "TTY", &s->tty, | |
339 | "DISPLAY", &s->display, | |
340 | "REMOTE_HOST", &s->remote_host, | |
341 | "REMOTE_USER", &s->remote_user, | |
98a28fef | 342 | "SERVICE", &s->service, |
a4cd87e9 | 343 | "DESKTOP", &s->desktop, |
a185c5aa | 344 | "VTNR", &vtnr, |
be94d954 | 345 | "STATE", &state, |
e6494a07 | 346 | "POSITION", &position, |
a185c5aa | 347 | "LEADER", &leader, |
a91e4e53 | 348 | "TYPE", &type, |
55efac6c | 349 | "CLASS", &class, |
9444b1f2 LP |
350 | "UID", &uid, |
351 | "REALTIME", &realtime, | |
352 | "MONOTONIC", &monotonic, | |
6d33772f | 353 | "CONTROLLER", &controller, |
a185c5aa LP |
354 | NULL); |
355 | ||
f647962d MS |
356 | if (r < 0) |
357 | return log_error_errno(r, "Failed to read %s: %m", s->state_file); | |
9444b1f2 LP |
358 | |
359 | if (!s->user) { | |
360 | uid_t u; | |
361 | User *user; | |
362 | ||
363 | if (!uid) { | |
364 | log_error("UID not specified for session %s", s->id); | |
365 | return -ENOENT; | |
366 | } | |
367 | ||
368 | r = parse_uid(uid, &u); | |
369 | if (r < 0) { | |
370 | log_error("Failed to parse UID value %s for session %s.", uid, s->id); | |
371 | return r; | |
372 | } | |
373 | ||
8cb4ab00 | 374 | user = hashmap_get(s->manager->users, UID_TO_PTR(u)); |
9444b1f2 LP |
375 | if (!user) { |
376 | log_error("User of session %s not known.", s->id); | |
377 | return -ENOENT; | |
378 | } | |
379 | ||
380 | session_set_user(s, user); | |
381 | } | |
a185c5aa LP |
382 | |
383 | if (remote) { | |
384 | k = parse_boolean(remote); | |
385 | if (k >= 0) | |
386 | s->remote = k; | |
387 | } | |
388 | ||
c506027a DH |
389 | if (vtnr) |
390 | safe_atou(vtnr, &s->vtnr); | |
391 | ||
9418f147 | 392 | if (seat && !s->seat) { |
a185c5aa LP |
393 | Seat *o; |
394 | ||
395 | o = hashmap_get(s->manager->seats, seat); | |
396 | if (o) | |
c506027a DH |
397 | r = seat_attach_session(o, s); |
398 | if (!o || r < 0) | |
399 | log_error("Cannot attach session %s to seat %s", s->id, seat); | |
a185c5aa LP |
400 | } |
401 | ||
c506027a DH |
402 | if (!s->seat || !seat_has_vts(s->seat)) |
403 | s->vtnr = 0; | |
a185c5aa | 404 | |
e6494a07 | 405 | if (position && s->seat) { |
49e6fdbf DH |
406 | unsigned int npos; |
407 | ||
e6494a07 | 408 | safe_atou(position, &npos); |
49e6fdbf DH |
409 | seat_claim_position(s->seat, s, npos); |
410 | } | |
411 | ||
a185c5aa | 412 | if (leader) { |
f8e2fb7b LP |
413 | k = parse_pid(leader, &s->leader); |
414 | if (k >= 0) | |
415 | audit_session_from_pid(s->leader, &s->audit_id); | |
a185c5aa LP |
416 | } |
417 | ||
a91e4e53 LP |
418 | if (type) { |
419 | SessionType t; | |
420 | ||
421 | t = session_type_from_string(type); | |
422 | if (t >= 0) | |
423 | s->type = t; | |
424 | } | |
425 | ||
55efac6c LP |
426 | if (class) { |
427 | SessionClass c; | |
428 | ||
429 | c = session_class_from_string(class); | |
430 | if (c >= 0) | |
431 | s->class = c; | |
432 | } | |
433 | ||
be94d954 MP |
434 | if (state && streq(state, "closing")) |
435 | s->stopping = true; | |
436 | ||
b4f78aea LP |
437 | if (s->fifo_path) { |
438 | int fd; | |
439 | ||
440 | /* If we open an unopened pipe for reading we will not | |
441 | get an EOF. to trigger an EOF we hence open it for | |
be94d954 MP |
442 | writing, but close it right away which then will |
443 | trigger the EOF. This will happen immediately if no | |
444 | other process has the FIFO open for writing, i. e. | |
445 | when the session died before logind (re)started. */ | |
b4f78aea LP |
446 | |
447 | fd = session_create_fifo(s); | |
03e334a1 | 448 | safe_close(fd); |
b4f78aea LP |
449 | } |
450 | ||
9444b1f2 LP |
451 | if (realtime) { |
452 | unsigned long long l; | |
453 | if (sscanf(realtime, "%llu", &l) > 0) | |
454 | s->timestamp.realtime = l; | |
455 | } | |
456 | ||
457 | if (monotonic) { | |
458 | unsigned long long l; | |
459 | if (sscanf(monotonic, "%llu", &l) > 0) | |
460 | s->timestamp.monotonic = l; | |
461 | } | |
a185c5aa | 462 | |
6d33772f DH |
463 | if (controller) { |
464 | if (bus_name_has_owner(s->manager->bus, controller, NULL) > 0) | |
465 | session_set_controller(s, controller, false); | |
90a18413 DH |
466 | else |
467 | session_restore_vt(s); | |
6d33772f DH |
468 | } |
469 | ||
a185c5aa | 470 | return r; |
20263082 LP |
471 | } |
472 | ||
473 | int session_activate(Session *s) { | |
d7bd01b5 DH |
474 | unsigned int num_pending; |
475 | ||
20263082 | 476 | assert(s); |
9444b1f2 | 477 | assert(s->user); |
20263082 | 478 | |
20263082 | 479 | if (!s->seat) |
15411c0c | 480 | return -EOPNOTSUPP; |
20263082 LP |
481 | |
482 | if (s->seat->active == s) | |
483 | return 0; | |
484 | ||
d7bd01b5 DH |
485 | /* on seats with VTs, we let VTs manage session-switching */ |
486 | if (seat_has_vts(s->seat)) { | |
92bd5ff3 | 487 | if (!s->vtnr) |
15411c0c | 488 | return -EOPNOTSUPP; |
d7bd01b5 DH |
489 | |
490 | return chvt(s->vtnr); | |
491 | } | |
492 | ||
493 | /* On seats without VTs, we implement session-switching in logind. We | |
494 | * try to pause all session-devices and wait until the session | |
495 | * controller acknowledged them. Once all devices are asleep, we simply | |
496 | * switch the active session and be done. | |
497 | * We save the session we want to switch to in seat->pending_switch and | |
498 | * seat_complete_switch() will perform the final switch. */ | |
499 | ||
500 | s->seat->pending_switch = s; | |
501 | ||
502 | /* if no devices are running, immediately perform the session switch */ | |
503 | num_pending = session_device_try_pause_all(s); | |
504 | if (!num_pending) | |
505 | seat_complete_switch(s->seat); | |
20263082 | 506 | |
d7bd01b5 | 507 | return 0; |
20263082 LP |
508 | } |
509 | ||
fb6becb4 | 510 | static int session_start_scope(Session *s) { |
98a28fef LP |
511 | int r; |
512 | ||
513 | assert(s); | |
9444b1f2 | 514 | assert(s->user); |
98a28fef | 515 | |
fb6becb4 | 516 | if (!s->scope) { |
4afd3348 | 517 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
39883f62 | 518 | char *scope, *job = NULL; |
90558f31 | 519 | const char *description; |
405e0255 | 520 | |
d0af76e6 LP |
521 | scope = strjoin("session-", s->id, ".scope", NULL); |
522 | if (!scope) | |
ae018d9b LP |
523 | return log_oom(); |
524 | ||
90558f31 LP |
525 | description = strjoina("Session ", s->id, " of user ", s->user->name, NULL); |
526 | ||
527 | r = manager_start_scope( | |
528 | s->manager, | |
529 | scope, | |
530 | s->leader, | |
531 | s->user->slice, | |
532 | description, | |
533 | "systemd-logind.service", | |
534 | "systemd-user-sessions.service", | |
535 | (uint64_t) -1, /* disable TasksMax= for the scope, rely on the slice setting for it */ | |
536 | &error, | |
537 | &job); | |
d0af76e6 | 538 | if (r < 0) { |
90558f31 | 539 | log_error_errno(r, "Failed to start session scope %s: %s", scope, bus_error_message(&error, r)); |
d0af76e6 | 540 | free(scope); |
f2d4f98d | 541 | return r; |
d0af76e6 LP |
542 | } else { |
543 | s->scope = scope; | |
544 | ||
545 | free(s->scope_job); | |
546 | s->scope_job = job; | |
547 | } | |
20263082 LP |
548 | } |
549 | ||
d0af76e6 | 550 | if (s->scope) |
90558f31 | 551 | (void) hashmap_put(s->manager->session_units, s->scope, s); |
d0af76e6 | 552 | |
20263082 LP |
553 | return 0; |
554 | } | |
555 | ||
556 | int session_start(Session *s) { | |
557 | int r; | |
558 | ||
559 | assert(s); | |
9444b1f2 LP |
560 | |
561 | if (!s->user) | |
562 | return -ESTALE; | |
20263082 | 563 | |
9418f147 LP |
564 | if (s->started) |
565 | return 0; | |
566 | ||
ed18b08b LP |
567 | r = user_start(s->user); |
568 | if (r < 0) | |
569 | return r; | |
570 | ||
fb6becb4 LP |
571 | /* Create cgroup */ |
572 | r = session_start_scope(s); | |
573 | if (r < 0) | |
574 | return r; | |
575 | ||
d9eb81f9 | 576 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
e2cc6eca | 577 | LOG_MESSAGE_ID(SD_MESSAGE_SESSION_START), |
877d54e9 LP |
578 | "SESSION_ID=%s", s->id, |
579 | "USER_ID=%s", s->user->name, | |
de0671ee | 580 | "LEADER="PID_FMT, s->leader, |
e2cc6eca | 581 | LOG_MESSAGE("New session %s of user %s.", s->id, s->user->name), |
877d54e9 | 582 | NULL); |
98a28fef | 583 | |
9444b1f2 LP |
584 | if (!dual_timestamp_is_set(&s->timestamp)) |
585 | dual_timestamp_get(&s->timestamp); | |
14c3baca | 586 | |
e9816c48 LP |
587 | if (s->seat) |
588 | seat_read_active_vt(s->seat); | |
589 | ||
9418f147 LP |
590 | s->started = true; |
591 | ||
952d3260 LP |
592 | user_elect_display(s->user); |
593 | ||
5f41d1f1 | 594 | /* Save data */ |
e9816c48 | 595 | session_save(s); |
7f7bb946 | 596 | user_save(s->user); |
5f41d1f1 LP |
597 | if (s->seat) |
598 | seat_save(s->seat); | |
e9816c48 | 599 | |
5f41d1f1 | 600 | /* Send signals */ |
da119395 | 601 | session_send_signal(s, true); |
952d3260 | 602 | user_send_changed(s->user, "Sessions", "Display", NULL); |
9418f147 LP |
603 | if (s->seat) { |
604 | if (s->seat->active == s) | |
cc377381 | 605 | seat_send_changed(s->seat, "Sessions", "ActiveSession", NULL); |
9418f147 | 606 | else |
cc377381 | 607 | seat_send_changed(s->seat, "Sessions", NULL); |
9418f147 LP |
608 | } |
609 | ||
20263082 LP |
610 | return 0; |
611 | } | |
612 | ||
9bb69af4 | 613 | static int session_stop_scope(Session *s, bool force) { |
4afd3348 | 614 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
39883f62 | 615 | char *job = NULL; |
20263082 | 616 | int r; |
20263082 LP |
617 | |
618 | assert(s); | |
619 | ||
fb6becb4 LP |
620 | if (!s->scope) |
621 | return 0; | |
9b221b63 | 622 | |
9bb69af4 | 623 | if (force || manager_shall_kill(s->manager, s->user->name)) { |
5f41d1f1 LP |
624 | r = manager_stop_unit(s->manager, s->scope, &error, &job); |
625 | if (r < 0) { | |
626 | log_error("Failed to stop session scope: %s", bus_error_message(&error, r)); | |
627 | return r; | |
628 | } | |
20263082 | 629 | |
5f41d1f1 LP |
630 | free(s->scope_job); |
631 | s->scope_job = job; | |
632 | } else { | |
633 | r = manager_abandon_scope(s->manager, s->scope, &error); | |
634 | if (r < 0) { | |
635 | log_error("Failed to abandon session scope: %s", bus_error_message(&error, r)); | |
636 | return r; | |
637 | } | |
638 | } | |
20263082 | 639 | |
9b221b63 | 640 | return 0; |
20263082 LP |
641 | } |
642 | ||
9bb69af4 | 643 | int session_stop(Session *s, bool force) { |
405e0255 LP |
644 | int r; |
645 | ||
646 | assert(s); | |
647 | ||
648 | if (!s->user) | |
649 | return -ESTALE; | |
650 | ||
5f41d1f1 LP |
651 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
652 | ||
10189fd6 DH |
653 | if (s->seat) |
654 | seat_evict_position(s->seat, s); | |
655 | ||
5f41d1f1 LP |
656 | /* We are going down, don't care about FIFOs anymore */ |
657 | session_remove_fifo(s); | |
658 | ||
405e0255 | 659 | /* Kill cgroup */ |
9bb69af4 | 660 | r = session_stop_scope(s, force); |
405e0255 | 661 | |
5f41d1f1 LP |
662 | s->stopping = true; |
663 | ||
952d3260 LP |
664 | user_elect_display(s->user); |
665 | ||
405e0255 | 666 | session_save(s); |
cc377381 | 667 | user_save(s->user); |
405e0255 LP |
668 | |
669 | return r; | |
670 | } | |
671 | ||
672 | int session_finalize(Session *s) { | |
118ecf32 | 673 | SessionDevice *sd; |
20263082 LP |
674 | |
675 | assert(s); | |
676 | ||
9444b1f2 LP |
677 | if (!s->user) |
678 | return -ESTALE; | |
679 | ||
ed18b08b | 680 | if (s->started) |
d9eb81f9 | 681 | log_struct(s->class == SESSION_BACKGROUND ? LOG_DEBUG : LOG_INFO, |
e2cc6eca | 682 | LOG_MESSAGE_ID(SD_MESSAGE_SESSION_STOP), |
877d54e9 LP |
683 | "SESSION_ID=%s", s->id, |
684 | "USER_ID=%s", s->user->name, | |
de0671ee | 685 | "LEADER="PID_FMT, s->leader, |
e2cc6eca | 686 | LOG_MESSAGE("Removed session %s.", s->id), |
877d54e9 | 687 | NULL); |
98a28fef | 688 | |
5f41d1f1 LP |
689 | s->timer_event_source = sd_event_source_unref(s->timer_event_source); |
690 | ||
10189fd6 DH |
691 | if (s->seat) |
692 | seat_evict_position(s->seat, s); | |
693 | ||
118ecf32 DH |
694 | /* Kill session devices */ |
695 | while ((sd = hashmap_first(s->devices))) | |
696 | session_device_free(sd); | |
697 | ||
491ac9f2 | 698 | (void) unlink(s->state_file); |
d2f92cdf | 699 | session_add_to_gc_queue(s); |
ed18b08b | 700 | user_add_to_gc_queue(s->user); |
14c3baca | 701 | |
405e0255 | 702 | if (s->started) { |
ed18b08b | 703 | session_send_signal(s, false); |
405e0255 LP |
704 | s->started = false; |
705 | } | |
50fb9793 | 706 | |
9418f147 LP |
707 | if (s->seat) { |
708 | if (s->seat->active == s) | |
709 | seat_set_active(s->seat, NULL); | |
710 | ||
23bd3b62 | 711 | seat_save(s->seat); |
5f41d1f1 | 712 | seat_send_changed(s->seat, "Sessions", NULL); |
9418f147 LP |
713 | } |
714 | ||
23bd3b62 | 715 | user_save(s->user); |
952d3260 | 716 | user_send_changed(s->user, "Sessions", "Display", NULL); |
9418f147 | 717 | |
491ac9f2 | 718 | return 0; |
20263082 LP |
719 | } |
720 | ||
5f41d1f1 LP |
721 | static int release_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) { |
722 | Session *s = userdata; | |
723 | ||
724 | assert(es); | |
725 | assert(s); | |
726 | ||
9bb69af4 | 727 | session_stop(s, false); |
5f41d1f1 LP |
728 | return 0; |
729 | } | |
730 | ||
ad8780c9 | 731 | int session_release(Session *s) { |
5f41d1f1 LP |
732 | assert(s); |
733 | ||
734 | if (!s->started || s->stopping) | |
ad8780c9 ZJS |
735 | return 0; |
736 | ||
737 | if (s->timer_event_source) | |
738 | return 0; | |
739 | ||
740 | return sd_event_add_time(s->manager->event, | |
741 | &s->timer_event_source, | |
742 | CLOCK_MONOTONIC, | |
743 | now(CLOCK_MONOTONIC) + RELEASE_USEC, 0, | |
744 | release_timeout_callback, s); | |
5f41d1f1 LP |
745 | } |
746 | ||
20263082 LP |
747 | bool session_is_active(Session *s) { |
748 | assert(s); | |
749 | ||
750 | if (!s->seat) | |
751 | return true; | |
752 | ||
753 | return s->seat->active == s; | |
754 | } | |
755 | ||
23406ce5 LP |
756 | static int get_tty_atime(const char *tty, usec_t *atime) { |
757 | _cleanup_free_ char *p = NULL; | |
a185c5aa | 758 | struct stat st; |
23406ce5 LP |
759 | |
760 | assert(tty); | |
761 | assert(atime); | |
762 | ||
763 | if (!path_is_absolute(tty)) { | |
764 | p = strappend("/dev/", tty); | |
765 | if (!p) | |
766 | return -ENOMEM; | |
767 | ||
768 | tty = p; | |
769 | } else if (!path_startswith(tty, "/dev/")) | |
770 | return -ENOENT; | |
771 | ||
772 | if (lstat(tty, &st) < 0) | |
773 | return -errno; | |
774 | ||
775 | *atime = timespec_load(&st.st_atim); | |
776 | return 0; | |
777 | } | |
778 | ||
779 | static int get_process_ctty_atime(pid_t pid, usec_t *atime) { | |
780 | _cleanup_free_ char *p = NULL; | |
781 | int r; | |
782 | ||
783 | assert(pid > 0); | |
784 | assert(atime); | |
785 | ||
786 | r = get_ctty(pid, NULL, &p); | |
787 | if (r < 0) | |
788 | return r; | |
789 | ||
790 | return get_tty_atime(p, atime); | |
791 | } | |
792 | ||
793 | int session_get_idle_hint(Session *s, dual_timestamp *t) { | |
23406ce5 LP |
794 | usec_t atime = 0, n; |
795 | int r; | |
a185c5aa LP |
796 | |
797 | assert(s); | |
798 | ||
23406ce5 | 799 | /* Explicit idle hint is set */ |
a185c5aa LP |
800 | if (s->idle_hint) { |
801 | if (t) | |
802 | *t = s->idle_hint_timestamp; | |
803 | ||
804 | return s->idle_hint; | |
805 | } | |
806 | ||
0762eaa3 | 807 | /* Graphical sessions should really implement a real |
23406ce5 LP |
808 | * idle hint logic */ |
809 | if (s->display) | |
a185c5aa LP |
810 | goto dont_know; |
811 | ||
23406ce5 LP |
812 | /* For sessions with an explicitly configured tty, let's check |
813 | * its atime */ | |
814 | if (s->tty) { | |
815 | r = get_tty_atime(s->tty, &atime); | |
816 | if (r >= 0) | |
817 | goto found_atime; | |
818 | } | |
a185c5aa | 819 | |
23406ce5 LP |
820 | /* For sessions with a leader but no explicitly configured |
821 | * tty, let's check the controlling tty of the leader */ | |
822 | if (s->leader > 0) { | |
823 | r = get_process_ctty_atime(s->leader, &atime); | |
824 | if (r >= 0) | |
825 | goto found_atime; | |
a185c5aa LP |
826 | } |
827 | ||
a185c5aa LP |
828 | dont_know: |
829 | if (t) | |
830 | *t = s->idle_hint_timestamp; | |
831 | ||
832 | return 0; | |
23406ce5 LP |
833 | |
834 | found_atime: | |
835 | if (t) | |
836 | dual_timestamp_from_realtime(t, atime); | |
837 | ||
838 | n = now(CLOCK_REALTIME); | |
839 | ||
840 | if (s->manager->idle_action_usec <= 0) | |
841 | return 0; | |
842 | ||
843 | return atime + s->manager->idle_action_usec <= n; | |
a185c5aa LP |
844 | } |
845 | ||
bef422ae LP |
846 | void session_set_idle_hint(Session *s, bool b) { |
847 | assert(s); | |
848 | ||
849 | if (s->idle_hint == b) | |
850 | return; | |
851 | ||
852 | s->idle_hint = b; | |
853 | dual_timestamp_get(&s->idle_hint_timestamp); | |
9418f147 | 854 | |
cc377381 | 855 | session_send_changed(s, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
9418f147 LP |
856 | |
857 | if (s->seat) | |
cc377381 LP |
858 | seat_send_changed(s->seat, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); |
859 | ||
860 | user_send_changed(s->user, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
861 | manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL); | |
862 | } | |
863 | ||
864 | static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) { | |
865 | Session *s = userdata; | |
866 | ||
867 | assert(s); | |
868 | assert(s->fifo_fd == fd); | |
869 | ||
870 | /* EOF on the FIFO means the session died abnormally. */ | |
871 | ||
872 | session_remove_fifo(s); | |
9bb69af4 | 873 | session_stop(s, false); |
cc377381 LP |
874 | |
875 | return 1; | |
bef422ae LP |
876 | } |
877 | ||
932e3ee7 LP |
878 | int session_create_fifo(Session *s) { |
879 | int r; | |
880 | ||
31b79c2b LP |
881 | assert(s); |
882 | ||
b4f78aea | 883 | /* Create FIFO */ |
932e3ee7 | 884 | if (!s->fifo_path) { |
d2e54fae | 885 | r = mkdir_safe_label("/run/systemd/sessions", 0755, 0, 0); |
e6061ab2 LP |
886 | if (r < 0) |
887 | return r; | |
888 | ||
932e3ee7 LP |
889 | if (asprintf(&s->fifo_path, "/run/systemd/sessions/%s.ref", s->id) < 0) |
890 | return -ENOMEM; | |
31b79c2b | 891 | |
932e3ee7 LP |
892 | if (mkfifo(s->fifo_path, 0600) < 0 && errno != EEXIST) |
893 | return -errno; | |
894 | } | |
31b79c2b | 895 | |
932e3ee7 | 896 | /* Open reading side */ |
b4f78aea | 897 | if (s->fifo_fd < 0) { |
b4f78aea LP |
898 | s->fifo_fd = open(s->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY); |
899 | if (s->fifo_fd < 0) | |
900 | return -errno; | |
901 | ||
cc377381 LP |
902 | } |
903 | ||
904 | if (!s->fifo_event_source) { | |
151b9b96 | 905 | r = sd_event_add_io(s->manager->event, &s->fifo_event_source, s->fifo_fd, 0, session_dispatch_fifo, s); |
b4f78aea LP |
906 | if (r < 0) |
907 | return r; | |
908 | ||
718db961 | 909 | r = sd_event_source_set_priority(s->fifo_event_source, SD_EVENT_PRIORITY_IDLE); |
cc377381 LP |
910 | if (r < 0) |
911 | return r; | |
b4f78aea | 912 | } |
932e3ee7 LP |
913 | |
914 | /* Open writing side */ | |
915 | r = open(s->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY); | |
916 | if (r < 0) | |
917 | return -errno; | |
31b79c2b | 918 | |
932e3ee7 LP |
919 | return r; |
920 | } | |
921 | ||
5f41d1f1 | 922 | static void session_remove_fifo(Session *s) { |
932e3ee7 LP |
923 | assert(s); |
924 | ||
03e334a1 LP |
925 | s->fifo_event_source = sd_event_source_unref(s->fifo_event_source); |
926 | s->fifo_fd = safe_close(s->fifo_fd); | |
932e3ee7 LP |
927 | |
928 | if (s->fifo_path) { | |
929 | unlink(s->fifo_path); | |
a1e58e8e | 930 | s->fifo_path = mfree(s->fifo_path); |
932e3ee7 | 931 | } |
31b79c2b LP |
932 | } |
933 | ||
cc377381 | 934 | bool session_check_gc(Session *s, bool drop_not_started) { |
20263082 LP |
935 | assert(s); |
936 | ||
4a4b033f | 937 | if (drop_not_started && !s->started) |
cc377381 | 938 | return false; |
932e3ee7 | 939 | |
9444b1f2 | 940 | if (!s->user) |
cc377381 | 941 | return false; |
9444b1f2 | 942 | |
932e3ee7 | 943 | if (s->fifo_fd >= 0) { |
5f41d1f1 | 944 | if (pipe_eof(s->fifo_fd) <= 0) |
cc377381 | 945 | return true; |
20263082 LP |
946 | } |
947 | ||
cc377381 LP |
948 | if (s->scope_job && manager_job_is_active(s->manager, s->scope_job)) |
949 | return true; | |
20263082 | 950 | |
cc377381 LP |
951 | if (s->scope && manager_unit_is_active(s->manager, s->scope)) |
952 | return true; | |
20263082 | 953 | |
cc377381 | 954 | return false; |
20263082 LP |
955 | } |
956 | ||
14c3baca LP |
957 | void session_add_to_gc_queue(Session *s) { |
958 | assert(s); | |
959 | ||
960 | if (s->in_gc_queue) | |
961 | return; | |
962 | ||
71fda00f | 963 | LIST_PREPEND(gc_queue, s->manager->session_gc_queue, s); |
14c3baca LP |
964 | s->in_gc_queue = true; |
965 | } | |
966 | ||
0604381b LP |
967 | SessionState session_get_state(Session *s) { |
968 | assert(s); | |
969 | ||
8fe63cd4 | 970 | /* always check closing first */ |
5f41d1f1 LP |
971 | if (s->stopping || s->timer_event_source) |
972 | return SESSION_CLOSING; | |
973 | ||
8fe63cd4 | 974 | if (s->scope_job || s->fifo_fd < 0) |
405e0255 | 975 | return SESSION_OPENING; |
fb6becb4 | 976 | |
0604381b LP |
977 | if (session_is_active(s)) |
978 | return SESSION_ACTIVE; | |
979 | ||
980 | return SESSION_ONLINE; | |
981 | } | |
982 | ||
de07ab16 | 983 | int session_kill(Session *s, KillWho who, int signo) { |
de07ab16 LP |
984 | assert(s); |
985 | ||
fb6becb4 | 986 | if (!s->scope) |
de07ab16 LP |
987 | return -ESRCH; |
988 | ||
fb6becb4 | 989 | return manager_kill_unit(s->manager, s->scope, who, signo, NULL); |
de07ab16 LP |
990 | } |
991 | ||
90a18413 | 992 | static int session_open_vt(Session *s) { |
5f41d1f1 | 993 | char path[sizeof("/dev/tty") + DECIMAL_STR_MAX(s->vtnr)]; |
90a18413 | 994 | |
baccf3e4 OB |
995 | if (s->vtnr < 1) |
996 | return -ENODEV; | |
90a18413 DH |
997 | |
998 | if (s->vtfd >= 0) | |
999 | return s->vtfd; | |
1000 | ||
92bd5ff3 | 1001 | sprintf(path, "/dev/tty%u", s->vtnr); |
22356953 | 1002 | s->vtfd = open_terminal(path, O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); |
4a62c710 | 1003 | if (s->vtfd < 0) |
709f6e46 | 1004 | return log_error_errno(s->vtfd, "cannot open VT %s of session %s: %m", path, s->id); |
90a18413 DH |
1005 | |
1006 | return s->vtfd; | |
1007 | } | |
1008 | ||
baccf3e4 | 1009 | int session_prepare_vt(Session *s) { |
90a18413 DH |
1010 | int vt, r; |
1011 | struct vt_mode mode = { 0 }; | |
90a18413 | 1012 | |
baccf3e4 OB |
1013 | if (s->vtnr < 1) |
1014 | return 0; | |
1015 | ||
90a18413 DH |
1016 | vt = session_open_vt(s); |
1017 | if (vt < 0) | |
baccf3e4 | 1018 | return vt; |
90a18413 | 1019 | |
d6176c6c | 1020 | r = fchown(vt, s->user->uid, -1); |
baccf3e4 | 1021 | if (r < 0) { |
94c156cd LP |
1022 | r = log_error_errno(errno, |
1023 | "Cannot change owner of /dev/tty%u: %m", | |
1024 | s->vtnr); | |
d6176c6c | 1025 | goto error; |
baccf3e4 | 1026 | } |
d6176c6c | 1027 | |
90a18413 | 1028 | r = ioctl(vt, KDSKBMODE, K_OFF); |
baccf3e4 | 1029 | if (r < 0) { |
94c156cd LP |
1030 | r = log_error_errno(errno, |
1031 | "Cannot set K_OFF on /dev/tty%u: %m", | |
1032 | s->vtnr); | |
90a18413 | 1033 | goto error; |
baccf3e4 | 1034 | } |
90a18413 DH |
1035 | |
1036 | r = ioctl(vt, KDSETMODE, KD_GRAPHICS); | |
baccf3e4 | 1037 | if (r < 0) { |
94c156cd LP |
1038 | r = log_error_errno(errno, |
1039 | "Cannot set KD_GRAPHICS on /dev/tty%u: %m", | |
1040 | s->vtnr); | |
90a18413 | 1041 | goto error; |
baccf3e4 | 1042 | } |
90a18413 | 1043 | |
90a18413 DH |
1044 | /* Oh, thanks to the VT layer, VT_AUTO does not work with KD_GRAPHICS. |
1045 | * So we need a dummy handler here which just acknowledges *all* VT | |
1046 | * switch requests. */ | |
1047 | mode.mode = VT_PROCESS; | |
92683ad2 DH |
1048 | mode.relsig = SIGRTMIN; |
1049 | mode.acqsig = SIGRTMIN + 1; | |
90a18413 | 1050 | r = ioctl(vt, VT_SETMODE, &mode); |
baccf3e4 | 1051 | if (r < 0) { |
94c156cd LP |
1052 | r = log_error_errno(errno, |
1053 | "Cannot set VT_PROCESS on /dev/tty%u: %m", | |
1054 | s->vtnr); | |
90a18413 | 1055 | goto error; |
baccf3e4 | 1056 | } |
90a18413 | 1057 | |
baccf3e4 | 1058 | return 0; |
90a18413 DH |
1059 | |
1060 | error: | |
90a18413 | 1061 | session_restore_vt(s); |
baccf3e4 | 1062 | return r; |
90a18413 DH |
1063 | } |
1064 | ||
1065 | void session_restore_vt(Session *s) { | |
16597ac3 LP |
1066 | |
1067 | static const struct vt_mode mode = { | |
1068 | .mode = VT_AUTO, | |
1069 | }; | |
1070 | ||
a0eb2a75 | 1071 | _cleanup_free_ char *utf8 = NULL; |
16597ac3 | 1072 | int vt, kb, old_fd; |
90a18413 | 1073 | |
128df4cf OT |
1074 | /* We need to get a fresh handle to the virtual terminal, |
1075 | * since the old file-descriptor is potentially in a hung-up | |
1076 | * state after the controlling process exited; we do a | |
1077 | * little dance to avoid having the terminal be available | |
1078 | * for reuse before we've cleaned it up. | |
1079 | */ | |
16597ac3 | 1080 | old_fd = s->vtfd; |
128df4cf OT |
1081 | s->vtfd = -1; |
1082 | ||
90a18413 | 1083 | vt = session_open_vt(s); |
128df4cf OT |
1084 | safe_close(old_fd); |
1085 | ||
90a18413 DH |
1086 | if (vt < 0) |
1087 | return; | |
1088 | ||
2bf10523 | 1089 | (void) ioctl(vt, KDSETMODE, KD_TEXT); |
90a18413 DH |
1090 | |
1091 | if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && *utf8 == '1') | |
1092 | kb = K_UNICODE; | |
16597ac3 LP |
1093 | else |
1094 | kb = K_XLATE; | |
03e334a1 | 1095 | |
2bf10523 | 1096 | (void) ioctl(vt, KDSKBMODE, kb); |
90a18413 | 1097 | |
2bf10523 | 1098 | (void) ioctl(vt, VT_SETMODE, &mode); |
16597ac3 | 1099 | (void) fchown(vt, 0, (gid_t) -1); |
d6176c6c | 1100 | |
03e334a1 | 1101 | s->vtfd = safe_close(s->vtfd); |
90a18413 DH |
1102 | } |
1103 | ||
2ec3ff66 | 1104 | void session_leave_vt(Session *s) { |
ce540a24 DH |
1105 | int r; |
1106 | ||
2ec3ff66 DH |
1107 | assert(s); |
1108 | ||
1109 | /* This is called whenever we get a VT-switch signal from the kernel. | |
1110 | * We acknowledge all of them unconditionally. Note that session are | |
1111 | * free to overwrite those handlers and we only register them for | |
1112 | * sessions with controllers. Legacy sessions are not affected. | |
1113 | * However, if we switch from a non-legacy to a legacy session, we must | |
1114 | * make sure to pause all device before acknowledging the switch. We | |
1115 | * process the real switch only after we are notified via sysfs, so the | |
1116 | * legacy session might have already started using the devices. If we | |
1117 | * don't pause the devices before the switch, we might confuse the | |
1118 | * session we switch to. */ | |
1119 | ||
1120 | if (s->vtfd < 0) | |
1121 | return; | |
1122 | ||
1123 | session_device_pause_all(s); | |
ce540a24 DH |
1124 | r = ioctl(s->vtfd, VT_RELDISP, 1); |
1125 | if (r < 0) | |
56f64d95 | 1126 | log_debug_errno(errno, "Cannot release VT of session %s: %m", s->id); |
2ec3ff66 DH |
1127 | } |
1128 | ||
cc377381 | 1129 | bool session_is_controller(Session *s, const char *sender) { |
ae5e06bd DH |
1130 | assert(s); |
1131 | ||
1132 | return streq_ptr(s->controller, sender); | |
1133 | } | |
1134 | ||
b12e5615 DH |
1135 | static void session_release_controller(Session *s, bool notify) { |
1136 | _cleanup_free_ char *name = NULL; | |
6d33772f DH |
1137 | SessionDevice *sd; |
1138 | ||
b12e5615 DH |
1139 | if (!s->controller) |
1140 | return; | |
6d33772f | 1141 | |
b12e5615 | 1142 | name = s->controller; |
90a18413 | 1143 | |
b12e5615 DH |
1144 | /* By resetting the controller before releasing the devices, we won't |
1145 | * send notification signals. This avoids sending useless notifications | |
1146 | * if the controller is released on disconnects. */ | |
1147 | if (!notify) | |
1148 | s->controller = NULL; | |
6d33772f | 1149 | |
b12e5615 DH |
1150 | while ((sd = hashmap_first(s->devices))) |
1151 | session_device_free(sd); | |
1152 | ||
1153 | s->controller = NULL; | |
3cde9e8f DM |
1154 | s->track = sd_bus_track_unref(s->track); |
1155 | } | |
1156 | ||
1157 | static int on_bus_track(sd_bus_track *track, void *userdata) { | |
1158 | Session *s = userdata; | |
1159 | ||
1160 | assert(track); | |
1161 | assert(s); | |
1162 | ||
1163 | session_drop_controller(s); | |
1164 | ||
1165 | return 0; | |
6d33772f DH |
1166 | } |
1167 | ||
ae5e06bd | 1168 | int session_set_controller(Session *s, const char *sender, bool force) { |
b12e5615 | 1169 | _cleanup_free_ char *name = NULL; |
ae5e06bd DH |
1170 | int r; |
1171 | ||
1172 | assert(s); | |
1173 | assert(sender); | |
1174 | ||
1175 | if (session_is_controller(s, sender)) | |
1176 | return 0; | |
1177 | if (s->controller && !force) | |
1178 | return -EBUSY; | |
1179 | ||
b12e5615 DH |
1180 | name = strdup(sender); |
1181 | if (!name) | |
ae5e06bd DH |
1182 | return -ENOMEM; |
1183 | ||
3cde9e8f DM |
1184 | s->track = sd_bus_track_unref(s->track); |
1185 | r = sd_bus_track_new(s->manager->bus, &s->track, on_bus_track, s); | |
1186 | if (r < 0) | |
1187 | return r; | |
1188 | ||
1189 | r = sd_bus_track_add_name(s->track, name); | |
1190 | if (r < 0) | |
ae5e06bd | 1191 | return r; |
ae5e06bd | 1192 | |
90a18413 DH |
1193 | /* When setting a session controller, we forcibly mute the VT and set |
1194 | * it into graphics-mode. Applications can override that by changing | |
1195 | * VT state after calling TakeControl(). However, this serves as a good | |
1196 | * default and well-behaving controllers can now ignore VTs entirely. | |
1197 | * Note that we reset the VT on ReleaseControl() and if the controller | |
1198 | * exits. | |
1199 | * If logind crashes/restarts, we restore the controller during restart | |
1200 | * or reset the VT in case it crashed/exited, too. */ | |
baccf3e4 | 1201 | r = session_prepare_vt(s); |
13f493dc | 1202 | if (r < 0) { |
3cde9e8f | 1203 | s->track = sd_bus_track_unref(s->track); |
baccf3e4 | 1204 | return r; |
13f493dc | 1205 | } |
baccf3e4 | 1206 | |
b12e5615 DH |
1207 | session_release_controller(s, true); |
1208 | s->controller = name; | |
1209 | name = NULL; | |
1210 | session_save(s); | |
90a18413 | 1211 | |
ae5e06bd DH |
1212 | return 0; |
1213 | } | |
1214 | ||
1215 | void session_drop_controller(Session *s) { | |
1216 | assert(s); | |
1217 | ||
1218 | if (!s->controller) | |
1219 | return; | |
1220 | ||
3cde9e8f | 1221 | s->track = sd_bus_track_unref(s->track); |
b12e5615 DH |
1222 | session_release_controller(s, false); |
1223 | session_save(s); | |
1224 | session_restore_vt(s); | |
ae5e06bd DH |
1225 | } |
1226 | ||
fb6becb4 LP |
1227 | static const char* const session_state_table[_SESSION_STATE_MAX] = { |
1228 | [SESSION_OPENING] = "opening", | |
0604381b LP |
1229 | [SESSION_ONLINE] = "online", |
1230 | [SESSION_ACTIVE] = "active", | |
1231 | [SESSION_CLOSING] = "closing" | |
1232 | }; | |
1233 | ||
1234 | DEFINE_STRING_TABLE_LOOKUP(session_state, SessionState); | |
1235 | ||
20263082 | 1236 | static const char* const session_type_table[_SESSION_TYPE_MAX] = { |
2c5859af | 1237 | [SESSION_UNSPECIFIED] = "unspecified", |
3f49d45a | 1238 | [SESSION_TTY] = "tty", |
98a28fef | 1239 | [SESSION_X11] = "x11", |
d9eb81f9 | 1240 | [SESSION_WAYLAND] = "wayland", |
9541666b | 1241 | [SESSION_MIR] = "mir", |
e9e74f28 | 1242 | [SESSION_WEB] = "web", |
20263082 LP |
1243 | }; |
1244 | ||
1245 | DEFINE_STRING_TABLE_LOOKUP(session_type, SessionType); | |
de07ab16 | 1246 | |
55efac6c LP |
1247 | static const char* const session_class_table[_SESSION_CLASS_MAX] = { |
1248 | [SESSION_USER] = "user", | |
1249 | [SESSION_GREETER] = "greeter", | |
e2acb67b LP |
1250 | [SESSION_LOCK_SCREEN] = "lock-screen", |
1251 | [SESSION_BACKGROUND] = "background" | |
55efac6c LP |
1252 | }; |
1253 | ||
1254 | DEFINE_STRING_TABLE_LOOKUP(session_class, SessionClass); | |
1255 | ||
de07ab16 LP |
1256 | static const char* const kill_who_table[_KILL_WHO_MAX] = { |
1257 | [KILL_LEADER] = "leader", | |
1258 | [KILL_ALL] = "all" | |
1259 | }; | |
1260 | ||
1261 | DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |